There have been plenty of references to Lebo's book. But you should search for an impressive thread that Our Don started prior to publication of the second edition of Lebo's book. Lebo contacted Geoff to ask if people on these boards had any corrections, suggestions, etc. that he should include or consider for the second edition. There was a big output of erudition from people here. And, being asked to contribute to the GF fans' bible was an honor for all of us.